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Multi-Way Conventional loudspeakers with crossovers

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Old 20th May 2008, 03:38 AM   #11
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Talking Thanks to all!

Im very gratefull for your contributions.
Ill print off and study all suggestions and get my áged' father to assist with the crossover. He is a retired electronic technician.
Im very keen to hear what they sound like and if for $1000 I can match a set of $3000 Wharfedales or Focals.
Thanks again
Steve
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Old 20th May 2008, 04:40 AM   #12
Jay_WJ is offline Jay_WJ  United States
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This is interesting. Someone emailed a few days ago asking for a crossover design for MTM or TMM with four 830883's and two 810921's he already bought. Are you the same person?

In fact, a person in this forum (I believe marchel) built a TMM with a crossover I designed (posted above by sreten). Note that this crossover was from my quick, rough modeling.

Actually, I'm not so comfortable with a TMM 2.5-way design. Depending on midwoofers' HD profile and room acoustics, TMM can sound "heavy" due to its natural full, 6 dB BSC. Tweeter network fine tuning doesn't help much in this case.

A while ago, upon someone's request, I designed an MTM crossover for this driver combination. This was designed more carefully than the above TMM crossover. I sent this crossover to the person I talked about above. If you're interested, it's here:

http://www.geocities.com/woove99/Spk...ss_HDS_MTM.gif

As for the cabinet and port tuning, the same dimensions as those of my Usher/Peerless MTM design can be used.
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Old 20th May 2008, 06:56 AM   #13
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Im probably the one.
I dove into some pretty wild waters by attempting a DIY speaker project.
A little more research next time before I commit the cash.
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Old 20th May 2008, 09:32 AM   #14
Jay_WJ is offline Jay_WJ  United States
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Ah! Anyway, Steve, don't worry. You chose excellent drivers. You won't be disappointed with the result.
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Old 20th May 2008, 11:18 AM   #15
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Jay_WJ


Actually, I'm not so comfortable with a TMM 2.5-way design.
Depending on midwoofers' HD profile and room acoustics,
TMM can sound "heavy" due to its natural full, 6 dB BSC.
Tweeter network fine tuning doesn't help much in this case.
Hi,

I agree, a TMM 2.5 way is not a good idea for near wall placement,
they need space away from room boundaries. But they are much
less intrusive then a correctly hieghted MTM, which I do not like.

Zaph described "warm sounding" drivers (due to mild bass distortion)
balancing better with less BSC but I do not think that it applies here.

I think TMM 2.5 way is better than MTM 2 way, but not as flexible.

/sreten.
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Old 20th May 2008, 03:48 PM   #16
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hybridfiat you don't need any special skills or training to build crossovers - the kind of diagram Sreten posted from Jay's site makes a great template. A soldering iron and some solder and perf board and you're on your way.

Just dive into it and give it a try - I think you may derive great satisfaction out of doing this part of the build - it's actually quite fun and you'll gain a lot of knowledge and experience from doing so.
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Old 20th May 2008, 09:17 PM   #17
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Just remember when you complete your build to double check your crossover - working backwards from the drivers and measure DC resistance across the speaker terminals to make sure you don't have a short before you hook it up to your amp.

Then connect it to your amp and slowly apply power.
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Old 22nd May 2008, 03:10 AM   #18
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Will do.
Dad and I made a radio when I was 12 and I remember the satisfaction of hearing it play for the first time.
The drivers should arrive tommorrow, theyve been ordered for 2 weeks. must be coming by camel train via the Nullarbor.
Ill post to let you all know how they sound.
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Old 8th June 2008, 02:45 PM   #19
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Done the crossovers, tested and triple tested. They look a bit different but thats because I changed the layout the 2nd time to make it easier to follow the diagram.
Tried them with the drivers, no probs.
Next the enclosures.
Attached Images
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Old 8th June 2008, 02:57 PM   #20
tinitus is offline tinitus  Europe
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Oh boy, its very neat ... I dare not say, beginners problem

First, the two channels must be mounted exactly the same, preferably, if you want it to perform the best

Second, the inductors may cause problems, please study this

http://www.troelsgravesen.dk/coils.htm

You may not notice any problem, but anyway thats how it is

btw ... dont bother with short connections ... its much better to use the whole space with as much distance between the coils as possible

Its mean, I know, but others should agree
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